Nha is shackle, p/n 6kk562
A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 6220-00-224-5402
NSN 6220-01-226-1776
NSN 5950-00-286-3301
NSN 5895-00-332-7336
NSN 5960-00-884-2535
NSN 5950-00-032-6432
NSN 5920-00-759-1003
NSN 2925-00-412-2046
NSN 6105-00-008-6140
NSN 5985-01-392-0613
NSN 4140-01-245-8866
NSN 6650-00-103-3239